Improved burglar-alarm



J. J JACKSON.

Alarm Look.

No. 94,604. Patented Sep't. 7, 1869.

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Letters Patent No. 94,604, dated September 7, 1869.

IMPROVED BURGLAR-ALARM.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.-

Be it known that 1, JAMES J. JACKSON, of ()urwinsville, in the county of Clearfieid, and State of Pennsylvania, have invented a new and valuable Improvement in Burglar-Amrms; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being bad to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1, ofthe drawings, is a top view ofniy alarm.

Figure 2 is a side view of the same.

My invention relates to a means for rendering bolts secure against burglars, and consists, mainly, in the construction and novel arrangement of devices, whereby the bolt is made to set on an: alarm, when moved backward in the direction of its length.

The letter A, of the drawings, represents a bolt, of any pattern, having a notch in its upper surface, so formed that one of its walls is perpendicular, and the other gradually inclined.

The letter B represents a bar, confined to the door or window, by siaplcs a and b, and spring 0, and pivoted t0 the pawl E, at about its centre.

The pawl E is pivoted at one end to the door, and has its other end working in the teeth of the ratchetwheel 7", which controls the movementof the alarmmechauisrn F.

i} represents the alarm-bell;

The rod B is bent at It, and has a notch or step out into its lower side.

My device is thus operated:

When the bolt is closed into its socket, the bar B is lifted so that the upper face of the notch It will be dislodged from the pin z, which is fastened into the door.

Its foot will fall into the deepest part of the notch 11 in the bolt. The alarmis now wound up, the pawl E controlling the action of the spring of the alarm.

It is obvious that any attempt to cause the bolt to recede must result in lifting the foot of the rod A, on the inclined plane of the notch p, and thereby raising the pawl E out of, and clear of the teeth of the ratchetwheel m, thus setting olf the alarm. V

The step It lodging onthe pin 5, and being held there by the action of the spring 0, keeps the pawl E raised from the ratchet-wheel on, so that the alarm, being once set ofi', will run down.

What I claim as my invention, and desire to secure by Letters Patent, is-

The bolt A, having notclrp, in combination with the bar B, having step ll, working on pin 5, and pivoted to pawl E, controlling, through ratchet-wheel m, the clock-work of the alarm G.

In testimony that I claim the above, I have hereunto subscribed my name, in the presence of two witnesses.

JAMES J. J AGKSON Witnesses P. Gkmlkcnnn, J. W. HANEY. l 

